Is the natural energy caused by the heat. Is contained under the earth surface (Geo = world,Thermal = heat), usually under the earth's surface temperature will increase with depth, that is, the more deeply into the temperature is higher, and in the lower part. The crust (Continental Crust) or at a depth of about 25-30 kilometers.About 250, to 1000C while the center of the world, the temperature can be as high as 3 500 to 4, 500 degrees Celsius, เซีส.
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